/*
 * Copyright 2002-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.web.socket.messaging;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.springframework.messaging.simp.stomp.StompCommand;
import org.springframework.web.socket.TextMessage;

/**
 * A builder for creating WebSocket messages with STOMP frame content.
 *
 * @author Rossen Stoyanchev
 */
public class StompTextMessageBuilder {

    private final List<String> headerLines = new ArrayList<>();
    private StompCommand command;
    private String body;


    private StompTextMessageBuilder(StompCommand command) {
        this.command = command;
    }

    public static StompTextMessageBuilder create(StompCommand command) {
        return new StompTextMessageBuilder(command);
    }

    public StompTextMessageBuilder headers(String... headerLines) {
        this.headerLines.addAll(Arrays.asList(headerLines));
        return this;
    }

    public StompTextMessageBuilder body(String body) {
        this.body = body;
        return this;
    }

    public TextMessage build() {
        StringBuilder sb = new StringBuilder(this.command.name()).append("\n");
        for (String line : this.headerLines) {
            sb.append(line).append("\n");
        }
        sb.append("\n");
        if (this.body != null) {
            sb.append(this.body);
        }
        sb.append("\u0000");
        return new TextMessage(sb.toString());
    }

}
